High Light
May 02
2010
2010
In a colour organ how can we see a blinking of light at high frequency by using high pass filter with op.am?
while making a color organ in lab,i used low pass filter,high pass filter and band pass filter with op.amp.since at low frequency,time period in more we can clearly see the blinking of light.but at high frequency due to very small time period we cannot see with our eye.how could we make it really work and see the effect in LED at high frequency?
If you just want to confirm that the LEDs are blinking, then you could put a fan in between you and the LED to get a strobing effect, which might let you see the LED blink. Or, if you're able to pick up and move the circuit around, you could also see the blinking through persistence of vision (whip the LED around fast enough, and it will leave a dotted light in the air, due to it blinking).
However, if you want to see the LED blinking at all times (as a feature of the circuit for example), then you need some way of dividing the frequency down (i.e. a frequency divider). Or if you want all LEDs to blink at the same frequency, then maybe you could rectify the output you have now (the one that is causing the LED to blink) and have that drive an oscillator (a simple 555 timer circuit could probably do this), which you could use to blink the LEDs at a lower frequency.
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